Valve-controlling apparatus



May 2.8 1929 J. o. WooDsoME ,71522 VALVE coNTRoLLrNG APPARATUS Filedjune 1e. 1926 JoHN o. Woonsoivin, on NEW YORK,v N. fr.. f

vALvn-coN'rRoLniNe APPARATUS.

Application led June 16,

l'This invention relatesto valve controlling apparatus for steam drying system' suchas- 'paper machine driersand thel like;

For the economical operation of steam dryving systems, it is important Where possible to use low pressure steam and to maintain as low a back pressure on the systemas-is consistent with obtainingk the 'desi-red temperature' in the driers and With obtaining-an' etf cient transfer of lieatrom' the steam to the drying cylinders. In" order to utilize the sometimes limited and varyingavailable supplies of the exhaust steam from primary movers, such as steam engines,`pumps and turbines, in the drying system, various types of control apparatus have been devised for supplementing such low pressure steam with live steain. The econoinyoit the system `dev pei'idsupon the eficiency of such control ap- 20 paratus. l

It is, therefore, an object olf-this inventionI to provide a valvecontrolling apparatus for i drying systems, using both low and highpresties'of'live steam.

sure steamV that-.Will automatically regulate j the flowiof live steam to the driers, 4whereby a uniform pressure may be maintained in the driers without the use of unnecessary quanti-l k'It isa further object ot this invention 4to provide a steam drying system'wherein automatically Voperated diaphragm controlled valves are utilized'for controlling the flow of' low pressure and high pressure steam to the 'driers in accordanceV with the pressurev requirements ot said driers to 4maintain the vhighest drying efficiencies consistent l'with' economical use ofthe steam.

'\ YOther and tuijther" important objects of v.'.jthis invention-will be apparent' from the dis-` more 'fully described.

Figure 2-isan enlarged sectional view of 4d closures in the speciticati-on'anclv`tlie accompanying drawings. Y Y This invention (in axpreferred form.) is and Vhereinafterv lOnthe drawings: 1 j Figure 1 is a-ragmentary elevational View of my valve controlling apparatus as ap plied to a drying system tor paper machines,

with parts oli-the valves-'broken away and in',V

section to show their construction.

one tot the valves.

Figure 31s a broken-view'of` a modiied f' form Yot' valve control fory a drying system.

' As shownon the drawings;

The reteiciicenumeral lindicates a steamv 192e. semi No. 116,306.

drier headerA or manifold kleading to a steam using apparatussuch as the drying cylinders of a paper machine.

be connectedin at `the intake end rof said header 1 to control .the flow ,of steam into the header. The'partioular structure ofsaid" I l valve 2'will appear hereinat'ter. A low pires-` sure steam supply pipe 3 `is-connectedto the Vother side of said valve 2 by means of flanged piping 4, bolted. together in the usualvvay.

is connected intosaid piping 4, a diaphragm valve 7 being pl'acedin said live steamV liiiej 6 for controllingthaw-HOW;v of live Steam int-0 the pipi1ig4 y* The valves2 and 7. willnowbe described. Valve 2 (Fig 2)' comprises aglobular loodyv portion 8 having flanged ends 9 aiid an A inner A diaphragm conf trolled valve 2 (Figs. v1 and 2) is 'adapted'to'ool At some point'such as 5, alive steam line 6 Y 'sal Sis iiattened,vas at 13, and a valve =oper- Y atingdevice 14; is bolted or otherwise securedthereto. Said devicefll coinprises'upper andv pass throughxsaid stung boxes 15 andf16 and througlrpacking glands 19 and20'V threaded therein. Said valve` stem 18 carriesf a pair of vspaced valves 21adapted to-'fseat in the valvelseats 12. The Lipper s tuliing 'box l 15 is provided'with a recessed and'fflanged'"f.v r upper face 22, adapted to torni with a'siin'i-v larly flangeda-nd recessed cap '23 a chamber 24. A. flexible diaphragm or disc 255secured f 'to ,tliefupper end'ofl said valvestein18jisadapted toV be -clainpinglyheld at its perip'li- Very between said flanged .tace22gfan'd thej v liangedcap28.VY Threaded 'passages26`and-- 27 are provided in the face 22 and the lcap 23, 1' respectively,y communicating with the chaml loer 247cm opposite sides of-"the diaphragm' 25. Piping 28 and 29 connect withfsaid pas` sages V26 and 27 5 respectively, the piping vv28V leading` 'to a pipe() for 'conductings'ome fluid snchgas air undernieasured pressure, V` and the piping 29 connecting'with the` drier header 1. A lever armr 311 is pivoted vat one of: said lever lcarries slidablyinounted valves 21 against theirvalveseats'12.

`end to an arm" 17 'and is securedf'intermediate i i its ends to t'lievalves'tem '18. The free end l -llO weight 32, it'or adjusting the pressure of theJ v Valve 7 is similar in construction to valve 2, but since its valves 33 are intended to belclosed the greaterl part of the time, the weighted lever arm 34 is pivoted at one endto the valve :stem 35 and intermediate its ends to an arm 3 6. Piping 38 and 37 lead from the 'upper i .and lower halves of the diaphragm chamber 4r39 to the low pressure steam line 3 and to the ypipe 30, respectively. .Said pipe v is. pro- Votherfluid to the pressure Avided with a pressure'gauge 40and a valve '4lifor regulating the pressure of the fair or vdesired to be maintained in the dryer header.

The operationofthe valve controlling apfparatus isr substantially asfollows:.-VVhen-` Yever the pressure in the drier header 'falls be- Y,low that desi-red as shownonthe gauge 40 the -vditterential pressure in ythe diaphragm i cliainber24 of `valve2 causesthe diaphragm 25to flex upwardly, thereby raising the valve 'stem 1 8 andtopening the portsll; Theloiv Vpressure steam' i`rom the supplyV line 3 thereuponis admitted to ,theidrierheaderL If,

however, the Vpressureoi saidlowpressure steam is'notsutiicient to bring the pressure in the drierheader l up to vthat recorded by.` the;

ga'iige140, thediferential pressure in the diaphragm chamber 39,brought about lbythe pressuresin the respective lines'37 and 38, Willcause thevalve stem to move upward,

vlyto open the valves 33 and admit high ,pressure steam from theline 6 into thefdrier ofvalve7 operates to closefthe valves 33 to;

header. `Inth-is way, ther pressure in the drierlieader israpidly and automatically broiightup tothe desired pressure. Assoon as the. pressure recorded on the gauge 40 is exceeded bythe pressure in; the drier, the diaphragm 25ct valve Q operates to closer the valves 2l entirely. Similarly, when the presysure inthe lowpressure steam line 3 exceeds that ofthe pressure gauge v40:, the diaphragm shut oft the live steam. Y

siredpressure in the drier header. g The re-V vlli 'Will' b e'evident, therefore, that when the. desired pressurein'the drier header can be 'maintained' the use` of. low pressure steam alone, no live steam willlbe admitted,but that .when the p'ressurerin the drier header falls' below the required amount the low .pressure steam will be supplemented by livesteain iii ]ust suiiieieiitquantity' tof niaintaingthe desultin 0' D v Saving from such automatic control VVof the steam ijs apparent. l

.In Fig. 3'y there is .shownl alslightly modifV phragmfcontrolled valve'v 46.y A- similar .valve 47 inthe linel 44 .connects the exhaust steam line-'43 with -anexhaust relief line 48.

Said valves 46 and 47 are operated as above described by Vmeans of diaphragm-mechanisms 49 and'50 respectively, each connected to a source o'fairor other fluid made pressure andV to the drier header. A pipe 5l adV n mits the air or other fluidy under pressure through aregulatingyalve 52 into piping53, providedwith a gauge 54. The pressure in the line 53 istransmitted throughthe pipes 55 and 56' respectively to the lowerside of the valve diaphragiiis49 and 50. The uplfA per sidesot saiddiaphragms 49 aiidfO are connected bypipes 5 7 and 58 to the drier header 42.

v lf,.now, the pressure in the drierv header falls below the.desiredpressure as recorded on thegauge 54,'the diaphragm 49 operatesto open thevalve 46 to admit-live steam, Other- Wise, the exhaust steam'only is used.y When the pressure of the exhaust steam is greater 1 thanl that desired in thev drier header, vthe valve 47 opened by automatic operation of Y the diaphragin-mechanism 50 to vent the ex.-`

cess' exhaust steam.

' Thelresults attained in .boththe arrange` VVments .ofvalve controlling ap parat-us are substantiallythesame, in that only low pressure j Vsteam is used when possible to' maintainfthe desired pressure. In the. modified `arrangement, further provision is made to cutdown the back pressure inl the exhaust steamgline ,by inserting an automatically operated exhaust relief valve. Otherwise the backgpresf, Vsure inthe exhaust steamv line might build up suiciently to seriouslylowertli'e eticien` cies ofthe engines or other primarymovers from. which the exhaust steam is being ob tained.v

I, am aware that numerous details offeonstructionmay be varied through a wide range without departingfrom the principles ofthis invention, yand I therefore, vdo vnot purpose f .b i. L necessitated by the p riorart. Y l claim Aasiny invention: 5

In a steam drying systeniincluding a di" limitin01the natent granted otherwise than ing header, a low pressuresteam line, a valve betweenV said: 10W pressure steam 'line v,and said header, valve closing means on Vsaid valve responsive to the steam'pressiireof said header, ahigh pressurev steamline, a .valve between saidA high pressuresteam line and. Y

said low pressure steam line,` valve closing means on said last namedvalv'e responsive'to the steam pressure of said low pressuresteain line, and means for 'simultaneously varying` the responsivity of sai-d valves to their respective steam pressures, said means comprising a .7,-1 Y

source of air under regulatable pressure, and

means for admitting the air from said source f of ressure for openingthe valves.

n testimonywhereof I lhave hereiii'itosubKnr scribed my. name.

.; JOHN'O. WooDsoiiE. 

